Improvement in augers



JAMES SWAN.

Improvement in Au-gfs. I N0 H5 541. Patented May 3'0,t871.

JAMESSWAN, or SEYMOUR, CONNECTICUT.

IMPROVEMENT IN AUGERS.

Specification forming part of Letters Patent No. 115,541, dated May 30,1871.

To all whom it may concern-.-

Be it known that I, JAMES- SWAN, of Seymour, in the county of New Havenand State of Connecticut, have invented a new Improvement in Auger-Bit;and I do hereby declare the following, when taken in connection with theaccompanying drawing and the letters of reference marked thereon, to bea full, clear, and exact description of the same, and which said drawingconstitutes part of this specification, and represents, in

Figure 1, a side view; Fig. 2, an end view; and in Fig. 3, an end viewof the Cooke bit of the same size.

This invention relates to an improvement in what is known as the Cookebit, patented June 17, 1851. In that bit the cutting-edge,'commencing atthe screw, falls back, so that the most advanced cutting-point is at theextreme edge. The object of my invention is to cause the cut to commenceat the center and act as a shave from that point to the extreme edge,whereby the tearing often experienced in the use of the Cooke bit isavoided; and it consists in starting the cut of the floor-lip at nearlythe opposite side of the screw-point to that in which the floor-lipterminates, 'and making the edge of a spiral form around the point tothe opposite side; then reversing the curve, carrying it forward up tothe termination of the gouge-lip, as more fully hereafter described.

The twist A of the hit is formed in the usual manner as for the Cookebit. In the Cooke bit the floor-lip commences at the point i, on thesame side and nearly in the same radial line as its termination n,whereby the cut is practically a square cut, the extreme being, ifanything, a little in advance; whereas in my improvement I commence thefloor-lip at the point 66. From this point the cutter curves around toabout the point 6, or half way from the center to the edge, and whichlast-named point is nearly opposite to the point of starting. From thepoint I) the curve is reversed and made concave up to the completion ofthe gouge-1i p d,- hence the cut acts as a shave to gradually out fromthe point a toward the extreme edge, the center being always in ad-Vance.

I do not broadly claim a gouge-lip, as such, I am aware is thewell-known Cooke patent; but

I do claim as my invention, and as an improvement on the Ransom Cookepatent bit- The floor-lip constructed as herein described, commencing ata point at or nearly upon the opposite side of the center from itstermination, and curved around the center up to the extreme edge of thecut, in the manner as herein set forth. 1

JAMES SWAN.

Witnesses:

JOHN H. SHUllIWAY, A.-J. TIBBrrs.

